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Rehabilitation of an existing reinforced concrete structure. Mohammad Yousuf AlMuhaideb 200620496 Ammar Abdulrahman Aljassmi 200620272 Mohammad Omar Nehaim 200602604 Ahmed Almansouri 200517330 Saeed Almashgouni 200411521. Project Code: CEM1-2 . Contents. Introduction

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Project code cem1 2

Rehabilitation of an existing reinforced concrete structure

Mohammad Yousuf AlMuhaideb 200620496

Ammar Abdulrahman Aljassmi 200620272

Mohammad Omar Nehaim 200602604

Ahmed Almansouri 200517330

Saeed Almashgouni 200411521

Project Code: CEM1-2


  • Introduction

  • Slab & Beam Designs

  • Columns & Foundation Designs

  • Cost Analysis

  • Conclusion


Ammar Aljassmi

The Aim

Problem Identification


The Design Process

Design Selection

The aim
The Aim

  • To study an existing building need to be rehabilitated

  • To learn the different techniques of rehabilitation

  • To understand the design of rehabilitated elements

Problem identification
Problem Identification

  • Owners would like to add floors

  • Owners want to change purpose of buildings

  • Buildings age

  • Change in municipal laws and regulations

Problem identification1
Problem Identification

  • Existing residential building consists of two floors

  • The owner would like to:

    • increase the number of floors to 4 Floors

    • change it from residential to office building

Project code cem1 2



Project code cem1 2

Study the changes


  • Study the different solutions:

    • Rehabilitation of the building

    • Demolish and rebuild the structure

  • Suggest to the owner the advantages and disadvantages of each solution in terms of:

    • Cost

    • Time


Demolish and Rebuild



  • Demolishing existing building

  • Construction of new building

    • 4 floors

    • Foundation

  • Strengthening

  • Partial demolishing and construction of few elements

  • Construction of additional floors



To accomplish the objectives; 5 main sub-objectives were set to be done in GP II:

  • Testing of columns

  • Analysis of tested columns

  • Method of rehabilitation to be used

  • Design strengthening of the elements

  • Decision evaluation

The design process
The Design Process

  • Identify actual loads acting on structure before applying new changes.

  • Calculate the load carrying capacity of each existing element.

  • Calculate the loads that would occur after applying the new changes.

  • New designs are to be made for the elements that need strengthening.

Slab beam designs
Slab & Beam Designs

Mohammad Omar

GP I Results

Conventional Design

FRP Design


Design Application

Conventional design
Conventional Design

  • To Find the Area of Steel Required for the Slabs:

  • (As) req. = calculated amount of steel

  • (As) act. = actual area of steel

Frp design
FRP Design

  • For the Calculation of FRP sheets, two methods were used:

    • Manual or Hand Calculations

    • Using the “Lamella” Software Program

Frp design1
FRP Design

  • Hand calculations:

Conventional application
Conventional Application

Step 1: Removing 70 mm of the concrete cover and Roughening the surface

Conventional application1
Conventional Application

Step 2: Installing the steel anchors

Conventional application2
Conventional Application

Step 3: Install the new amount of steel bars

Conventional application3
Conventional Application

Step 4: Casting the new layer of the concrete

Conventional design details
Conventional Design Details

Enlargement Of Beams

Conventional design details1
Conventional Design Details

Enlargement Of Beams

Frp design details
FRP Design Details

Frp design details1
FRP Design Details

Column foundation designs
Column & Foundation Designs


Al mansouri

GP I Results

Conventional Design of Columns

FRP Design of Columns

Foundation Design

Foundation Details

Gp i results columns1
GP I Results (Columns)

Pu (Design) = (φ) (α) [0.85 fc’ (Ag - Ast) + fy.Ast]

Conventional design2
Conventional Design

  • Usually called Section Enlargement or Concrete Jacketing

  • Manual or hand calculation is the method used for design

Frp design details2
FRP Design Details

1 design specified for the 5 columns

5 layers of FRP sheet type 240 (300 g/m2)

Foundation designs
Foundation Designs

  • Step 1: A calculation of the total load that comes from the columns for each strip, the dimensions for each strip is found as well.

  • Step 2: The stresses coming from each strip footing are then calculated.

  • Step 3: The stresses are then compared with bearing capacity of soil, if the stress of footing greater than the bearing capacity of the soil then the footing is considered to be “Unsafe”.

Foundation strengthening design
Foundation Strengthening Design

  • Step 1: Find new width of footing after the increased load by using this equation:

  • Step 2: Find the Area of the new required steel reinforcement.

Foundation strengthening design1
Foundation Strengthening Design

The Area of steel required (678.7) is smaller than the existing Area of steel (769.7) which means that the footing is considered “Safe”.

Cost and time analyses
Cost and Time Analyses


Al Muhaideb

Cost Analysis

Time Analysis

Comparison Between the Alternatives

Cost analysis
Cost Analysis

3 cost estimates


4 parts


Partial Demolition

Partial Construction

Construction of Additional Floors

  • Rehabilitation

    • CFRP

    • Conventional

  • Demolish and Rebuild

Time analysis
Time Analysis

What about time?

  • Time represents money

  • Time comparison variables

    • Rentable area = total area – services area

    • 70 % occupancy level

    • Yearly rent is AED 120 /m2

    • Rent is collected quarterly

Time is money
Time is Money

18 months period

1 month intervals

Time is money1
Time is Money

5 years period

4 months intervals


Saeed Almashgouni